1) A power plant runs on a modified Rankine cycle with two turbines and a preheater...

 

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1) A power plant runs on a modified Rankine cycle with two turbines and a preheater between the pump and the boiler. Steam exits the boiler at 5000 kPa and 550 C. The steam exits the first turbine at 1200 kPa and the second turbine at 50 kPa. A portion of the stream leaving the first turbine is used to raise the temperature of the stream leaving the pump to 180 C. The hot stream leaving the preheater is saturated liquid. The first turbine is 74% efficient, the second turbine is 86% efficient, and the pump efficiency is 82%. All streams entering the condenser are at the same pressure, and the condenser fully liquefies the streams. a. Draw the process flow diagram. Hint: you may have 9 or 10 streams, depending on how you label the stream split between turbine 1 and 2. b. What is the fraction of the stream leaving the first turbine that is sent to the preheater? c. What is the thermal efficiency of the entire process? d. What (if any) information that you calculated or were given did you not need for this problem? 1) A power plant runs on a modified Rankine cycle with two turbines and a preheater between the pump and the boiler. Steam exits the boiler at 5000 kPa and 550 C. The steam exits the first turbine at 1200 kPa and the second turbine at 50 kPa. A portion of the stream leaving the first turbine is used to raise the temperature of the stream leaving the pump to 180 C. The hot stream leaving the preheater is saturated liquid. The first turbine is 74% efficient, the second turbine is 86% efficient, and the pump efficiency is 82%. All streams entering the condenser are at the same pressure, and the condenser fully liquefies the streams. a. Draw the process flow diagram. Hint: you may have 9 or 10 streams, depending on how you label the stream split between turbine 1 and 2. b. What is the fraction of the stream leaving the first turbine that is sent to the preheater? c. What is the thermal efficiency of the entire process? d. What (if any) information that you calculated or were given did you not need for this problem?